Improvement in polishing-chucks



E. M. POMIERQY. POLISHING-CHUCK.

No.174,152, Patented Feb. 29,1876.

"PETERS, PNOTO-LITHOGRAFHER, WASHINGTON. D4 C.

UNITED STATES PATENT Drrron.

ELISHA M. PoMnRoY, OF WALLINGFORD, CONNECTICUT.

IMPROVEMENT IN POLlSHlNG- C HUCKS.

Specification forming part of Letters Patent No. 174,152, dated February29, 1876; application filed I January 24, 1876.

To all whom it may concern Be it known that I, ELISHA M. POMEROY, ofWallingford, in the county of New Haven and State of Connecticut, haveinvented a new Improvement in Chucks for Burnishing Plated Ware; and- Ido hereby declare the following, when taken in connection with theaccompanying drawiu gs and the letters of reference marked thereon, tobe a full, clear, and exact description of the same, and which saiddrawings constitute part of this specification, andrepresent iii- Figure1, perspective View; Fig. 2, central section; Fig. 3, plan of acaster-ring; Fig. 4, I partial section, showing the ring in position.

This invention relates to an improvement in a chuck for holding articlesof plated were for burnishing, specially designed for tablecaster rings,thatis, the perforated ring or plate through which the bottles areinserted.

-This has usually been burnished by. hand, which is a laborious processand occupying so much time as to make this a very considerable item inthe expense of production.

The object of this invention is to construct a chuck which will not onlyhold the ring,but at the same time fill the perforations so as to form,substantially, a planesurface, and so that the burnisher'may run overthe whole surface,

whilerevolving, without detriment to the sur face of the ring or edge ofthe perforations, as would be the case if such an operation wereattempted without this chuck; and the invention consists in a base orplate fitted to be ter-ring, and constructed with a hub, B, or

other device, by which to be attached to the revolving mandrel, in,substantially, the usual manner for attaching other face-plates. In theface of this plate several recesses, a, are formed, corresponding to theseveral openings, c, in the caster-ring. Into these recesses the bossesD are placed, preferably prevented from revolving on their own axis bymeans of a lug extending into acorresponding groove in the side-of therecess. Between the bosses and the bottom of the recesses an elasticmaterial, d, is placed to form the bed for the bosses, and from theopposite side of the plate a screw, E, is run into each boss, by meansof which the boss may be drawn down into the recess, or allowed to riseor be forced from it.

These bosses are made of a soft metal, or faced with a soft-metal cap,F, the nature of the metal being, substantially, that of or the same asthe caster-ring to be burnished. The caster-ring is placed upon thechuck. the openings c passing on to the respective bosses D, and as seenin Fig. 4, and the face of the bosses adjusted to correspond to the faceof thecaster-ring. -In this condition the chuck and ring are caused torevolve rapidly, and the burnisher is passed over the surface in theusual manner for burnishing plane surfaces on a chuck. The edges of theopenings in a casterring are usually rounded, and the outer or exposededge of the bosses are also rounded; hence, as the burnisher passes fromthe surface of the ring to the surface of the boss it does soover therounded edge of the boss, and the slight elasticity of the boss preventsthejumping of the'burnisher as it passes from one surface to another,thus enabling the burnishing of caster-rings and similararticles withequal facility with which a plane revolving surface may be burnished.

1. The herein-described chuck for burnishing plated ware, consisting ofthe plate A, combined with bosses 1) corresponding to the openings inthe article to be burnished, substantially as described.

2. The herein'described chuck for'burnislr- .ing plated ware, consistingof the plate A,

constructed with the recesses a, combined with adjustable bosses 1)corresponding to the openings in the article to be burnished, and theelastic bed (I for the bosses, substantially as described.

ELISHA M. POMEROY. Witnesses HARRISON FooTE, LUcIEN PoMERoY.

